A fourth victim was also treated by medics but had left before police arrived.

Garage Nation posted an official statement on their Facebook page:

"Thank you to everyone who came to our festival over the weekend.

"We are deeply saddened by the reported incident that took place on Saturday, we take security very seriously and have put on over a thousand different events over the years the vast majority all occur without incident, we booked an industry led security company & booked in full body search & metal detectors so we are thoroughly investigating the claims that some of the security were not delivering this.

"We gave and are continuing to give the authorities our full cooperation, we worked tirelessly to ensure that the rest of the day and the festival on Sunday continued safely, we would like to thank all the authorities for their support in this."

In the video, which was uploaded by London 999 Feed, groups of men are seen fighting amongst themselves while other members of the public stand and watch in horror.

At the start of the footage, one male is stamped on by another man, before the fight escalates to another area of the field.

It is understood that the video has already been passed on to the Metropolitan Police, with officers from the East Area Command Unit currently investigating this incident.